steps

In a small bowl, whisk together the flour, pepper and milk. Melt butter in a skillet over medium heat, add onion and cook until tender and
translucent. Add milk mixture to skillet and cook, stirring constantly, until thick and bubbly. Add cubed ham to sauce and heat through.

Plate out spaghetti, top with beans and pour sauce over. Sprinkle with Parmesan cheese and garnish with chopped parsley.